media: rkvdec: vdpu383: Drop bitfields for the bitwriter

media: rkvdec: vdpu383: Drop bitfields for the bitwriter

The VDPU383 support for hevc and h264 use structs with bitfields to
represent the SPS and PPS.

Because the fields are mostly unaligned and numerous, it brings compiler
issues, especially with clang.

To prevent that, switch to using the global bitwriter previously
introduced instead.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>